<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <!-- 购物车展示商品的地方 -->
        <ul class="cart-list" v-for="(good, index) in goods" :key="good.id">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="good.isChecked == 1"
              @change="updateChekced(good, $event)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="good.imgUrl" />
            <div class="item-msg">{{ good.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ good.skuPrice }}.00</span>
          </li>
          <li class="cart-list-con5">
            <a class="mins" @click="minusSkuNum(good)">-</a>
            <input
              :value="good.skuNum"
              class="itxt"
              @input="changeSkuNum(good, $event)"
            />
            <a class="plus" @click="addSkuNum(good)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ good.skuNum * good.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteGood(good)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="goods.length === selectGoods.length && goods.length > 0"
          @change="unSelectGood"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteAllChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ totalNum }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapGetters } from "vuex";
//节流:lodash/throttle
import throttle from "lodash/throttle";
import debounce from "lodash/debounce";
export default {
  name: "ShopCart",
  mounted() {
    //组件挂载完毕:先获取购物车的数据一次
    this.getCartList();
  },
  methods: {
    //获取购物车的数据
    getCartList() {
      this.$store.dispatch("shopcart/getCartList");
    },
    //加号按钮回调
    async addSkuNum(good) {
      //派发action修改商品的个数
      //修改商品数量成功了,再次获取购物车最新的数据
      try {
        await this.$store.dispatch("shopcart/updateGoodSkuNum", {
          skuId: good.skuId,
          skuNum: 1,
        });
        //再次获取购物车最新的数据
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    },
    //减号按钮的回调
    minusSkuNum: throttle(async function (good) {
      if (good.skuNum <= 1) return;
      try {
        await this.$store.dispatch("shopcart/updateGoodSkuNum", {
          skuId: good.skuId,
          skuNum: -1,
        });
        //再次获取购物车最新的数据
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    }, 1000),
    //文本框的事件
    changeSkuNum: debounce(async function (good, $event) {
      let content = $event.target.value * 1;
      let skuNum;
      if (isNaN(content) || content < 1) {
        //如果用户输入的内容非法:修改商品数量，不发生变化！！！！
        skuNum = 0;
      } else {
        skuNum = parseInt(content) - good.skuNum;
      }

      try {
        //修改商品的个数
        await this.$store.dispatch("shopcart/updateGoodSkuNum", {
          skuId: good.skuId,
          skuNum,
        });
        //再次获取购物车的数据
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    }, 1000),
    //勾选状态表单元素的事件
    async updateChekced(good, $event) {
      //准备参数
      let skuId = good.skuId;
      let isChecked = $event.target.checked ? 1 : 0;
      //通知vuex发请求
      try {
        //修改商品勾选状态成功
        await this.$store.dispatch("shopcart/updateGoodState", {
          skuId,
          isChecked,
        });
        this.getCartList();
      } catch (error) {
        alert("修改失败");
      }
    },
    //删除某一个商品
    async deleteGood({ skuId }) {
      try {
        //等待商品删除成功以后
        await this.$store.dispatch("shopcart/deleteGoodBySkuId", skuId);
        //再次获取购物车最新的数据
        this.getCartList();
      } catch (error) {
        alert("删除失败亲");
      }
    },
    //删除选中的商品
    async deleteAllChecked() {
      // this.selectGoods.forEach(async (item) => {
      //   //勾选的商品有几个，回调函数执行几次
      //   try {
      //     await this.$store.dispatch("shopcart/deleteGoodBySkuId", item.skuId);
      //     this.getCartList();
      //   } catch (error) {
      //     alert("删除失败");
      //   }
      // });

      try {
        //代表全部的勾选商品删除成功以后
        await this.$store.dispatch("shopcart/allchecked");
        //再次获取购物车的数据
        this.getCartList();
      } catch (error) {
        alert("删除失败");
      }
    },
    async unSelectGood(event){
      //获取全选复选框勾选的状态
      let isChecked = event.target.checked?1:0;
      //派发action
       try {
         //全部商品勾选状态变化
         await this.$store.dispatch('shopcart/changeChecked',isChecked);
         //再次获取购物车的最新的数据
         this.getCartList();
       } catch (error) {
          alert('修改失败');
       }

    }
  },
  computed: {
    ...mapGetters("shopcart", ["goods"]),
    //购物车支付总金额
    totalPrice() {
      return this.goods.reduce(
        (prev, next) => prev + next.skuPrice * next.skuNum,
        0
      );
    },
    //商品总个数
    totalNum() {
      return this.goods.reduce((prev, next) => prev + next.skuNum, 0);
    },
    //过滤出商品已经选中的
    selectGoods() {
      return this.goods.filter((item) => {
        return item.isChecked == 1;
      });
    },
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con3 {
          width: 20.8333%;

          .item-txt {
            text-align: center;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>